nl5b05283_si_001.pdf (526.01 kB)
Synergetic Effects of Inorganic Components in Solid Electrolyte Interphase on High Cycle Efficiency of Lithium Ion Batteries
journal contribution
posted on 2016-02-18, 00:00 authored by Qinglin Zhang, Jie Pan, Peng Lu, Zhongyi Liu, Mark W. Verbrugge, Brian W. Sheldon, Yang-Tse Cheng, Yue Qi, Xingcheng XiaoThe solid electrolyte interphase (SEI), a passivation
layer formed on electrodes, is critical to battery performance and
durability. The inorganic components in SEI, including lithium carbonate
(Li2CO3) and lithium fluoride (LiF), provide
both mechanical and chemical protection, meanwhile control lithium
ion transport. Although both Li2CO3 and LiF
have relatively low ionic conductivity, we found, surprisingly, that
the contact between Li2CO3 and LiF can promote
space charge accumulation along their interfaces, which generates
a higher ionic carrier concentration and significantly improves lithium
ion transport and reduces electron leakage. The synergetic effect
of the two inorganic components leads to high current efficiency and
long cycle stability.